I have a dirted tank with a HTH pool filtration sand cap and the sand has been making the water cloudy for the last 2 week. The tank is already planted and has fish in it. How should I get the cloudy water out. My tank is 180 gallons and it has a Fx4. The tank is cycled and i know it is not a bacterial bloom. Also the tank is only cloudy with the tank lights on when the the room lights are the only lights on I can see threw the tank and it is crystal clear. Also the tank was clear 5 days after I set it up then the bloom came then the cloudy sand water.